This is a drop-in Rectify speaker for current BLI Stealth GP35s. No modifications are required to replace the stock speaker.
 
Simply "pop" the stock speaker off (it's only attached with super glue) and stick the SSS UFIT-2318 to the chassis with thin mounting-tape. You can reuse the stock 2-pin wire-harness or purchase the Small 2-pin 1.0 harness I have available in the PARTS category.
 
The speaker comes assembled and tested